Car Mods That Push The Law To The Limit Limo-tinted front windows are illegal in many U.S. states. True False None Straight-pipe exhaust systems are legal everywhere in the United States. True False None Neon underglow lights are banned across the entire country. True False None Installing a nitrous oxide (NOS) system is illegal to even possess in a car in some states. True False None Oversized lift kits on trucks can sometimes be illegal if they exceed height regulations. True False None Time's up Most Popular Most Popular